java.lang.ClassCastException: va cannot be cast to xl
at biv.a(SourceFile:469)
at ft.a(SourceFile:44)
at ft.a(SourceFile:10)
at ef.a(SourceFile:164)
at biy.e(SourceFile:212)
at azd.o(SourceFile:1281)
at azd.ad(SourceFile:753)
at azd.e(SourceFile:704)
at net.minecraft.client.main.Main.main(SourceFile:103)

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Stacktrace:
at biv.a(SourceFile:469)
at ft.a(SourceFile:44)
at ft.a(SourceFile:10)
at ef.a(SourceFile:164)
at biy.e(SourceFile:212)